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The Expanding Approvals Rule: Improving Proportional Representation and Monotonicity 3 Working Paper The Expanding Approvals Rule: Improving Proportional Representation and Monotonicity Haris Aziz · Barton E. Lee Abstract Proportional representation (PR) is often discussed in voting settings as a major desideratum. For the past century or so, it is common both in practice and in the academic literature to jump to single transferable vote (STV) as the solution for achieving PR. Some of the most prominent electoral reform movements around the globe are pushing for the adoption of STV. It has been termed a major open prob- lem to design a voting rule that satisfies the same PR properties as STV and better monotonicity properties. In this paper, we first present a taxonomy of proportional representation axioms for general weak order preferences, some of which generalise and strengthen previously introduced concepts. We then present a rule called Expand- ing Approvals Rule (EAR) that satisfies properties stronger than the central PR axiom satisfied by STV, can handle indifferences in a convenient and computationally effi- cient manner, and also satisfies better candidate monotonicity properties. In view of this, our proposed rule seems to be a compelling solution for achieving proportional representation in voting settings. Keywords committee selection · multiwinner voting · proportional representation · single transferable vote. JEL Classification: C70 · D61 · D71 1 Introduction Of all modes in which a national representation can possibly be constituted, this one [STV] affords the best security for the intellectual qualifications de- sirable in the representatives—John Stuart Mill (Considerations on Represen- tative Government, 1861). arXiv:1708.07580v2 [cs.GT] 4 Jun 2018 H. Aziz · B. E. Lee Data61, CSIRO and UNSW, Sydney 2052 , Australia Tel.: +61-2-8306 0490 Fax: +61-2-8306 0405 E-mail: [email protected], [email protected] 2 Haris Aziz, Barton E. Lee A major unsolved problem is whether there exist rules that retain the impor- tant political features of STV and are also more monotonic—Woodall (1997). We consider a well-studied voting setting in which n voters express ordinal prefer- ences over m candidates and based on the preferences k ≤ m candidates are selected. The candidates may or may not be from particular parties but voters express prefer- ences directly over individual candidates.1 This kind of voting problem is not only encountered in parliamentary elections but to form any kind of representative body. When making such a selection by a voting rule, a desirable requirement is that of proportional representation. Proportional representation stipulates that voters should get representation in a committee or parliament according to the strengths of their numbers. It is widely accepted that proportional representation is the fairest way to reflect the diversity of opinions among the voters.2 For the last 120 years or so, the most widely used and accepted way to achieve it is via single transferable vote (STV) (Black, 1958; Tideman and Richardson, 2000) and its several variants. In fact STV is used for elections in several countries in- cluding Australia, Ireland, India, and Pakistan. It is also used to select representative committees in hundreds of settings including professional organisations, scientific or- ganizations, political parties, school groups, and university student councils all over the globe.3 The reason for the widespread adoption of STV is partly due to the fact that it has been promoted to satisfy proportional representation axioms. In par- ticular, STV satisfies a key PR axiom called Proportionality for Solid Coalitions (PSC) (Tideman and Richardson, 2000; Woodall, 1994). Tideman (1995) argues that “It is the fact that STV satisfies PSC that justifies describing STV as a system of proportional representation.” Woodall (1997) also calls the property the “essential feature of STV, which makes it a system of proportional representation.” Dummett (1984) motivated PSC as a minority not requiring to coordinate its report and that it should deserve some high preferred candidates to be selected as long as enough vot- ers are ‘solidly committed to such candidates.’ PSC captures the idea that as long as voters have the same top candidates (possibly in different ordering), they do not need to coordinate their preferences to get a justified number of such candidates selected. In this sense PSC is also similar in spirit to the idea that if a clone of a candidate is introduced, it should not affect the selection of the candidate. Voters from the same party not having to coordinate their reports as to maximize the number of winners from their own party can be viewed as a weak form of group-strategyproofness. PSC can also be seen as a voter’s vote not being wasted due to lack of coordination with 1 The setting is referred to as a preferential voting system. It is more general and flexible than settings in which voters vote for their respective parties and then the number of seats apportioned to the parties is proportional to the number of votes received by the party (Pukelsheim, 2014). 2 Proportional representation may be the fairest way for representation but it also allows for extreme group to have some representation at least when the group is large enough. PR also need not be the most effective approach to a stable government. Black (1958) wrote that “It [PR] makes it difficult to form a cabinet which can command a parliamentary majority and so makes for weak government.” 3 Notable uses of STV include Oscar nominations, internal elections of the British Liberal Democrats, and selection of Oxford Union, Cambridge Union, and Harvard/Radcliffe Undergraduate Councils. The Expanding Approvals Rule: Improving Proportional Representation and Monotonicity 3 like-minded voters. PSC has been referred to as “a sine qua non for a fair election rule” by Woodall (1994).4 Although STV is not necessarily the only rule satisfying PR properties, it is at times synonymous with proportional representation in academia and policy circles. The outcome of STV can also be computed efficiently which makes it suitable for large scale elections.5 Another reason for the adoption of STV is historical. Key fig- ures proposed ideas related to STV or pushed for the adoption of STV. The ideas behind STV can be attributed to several thinkers including C. Andrae, T. Hare, H. R. Droop, and T. W. Hill. For a detailed history of the development of STV family of rules, please see the article by Tideman (1995). In a booklet,Aiyar (1930) explains the rationale behind different components of the STV rule. STV was supported by influ- ential intellectuals such as John Stuart Mill who placed STV “among the greatest im- provements yet made in the theory and practice of government.” Bowler and Grofman (2000) note the British influence on the spread of STV among countries with histori- cal association with Great Britain. With historical, normative, and computational motivation behind it, STV has be- come the ‘go to’ rule for PR and has strong support.6 It is also vigorously promoted by prominent electoral reform movementsacross the globe including the Proportional Representation Society of Australia (http://www.prsa.org.au) and the Electoral Reform Society (https://www.electoral-reform.org.uk). Despite the central position of STV, it is not without some flaws. It is well- understood that it violates basic monotonicity properties even when selecting a single candidate (see e.g., Doron and Kronick, 1977; Zwicker, 2016). Increasing the rank- ing of the winning candidate may result in the candidate not getting selected. STV is also typically defined for strict preferences which limits its ability to tackle more general weak orders. There are several settings where voters may be indifferent be- tween two candidates because the candidates have the same characteristics that the voter cares about. It could also be that the voter does not have the cognitive power or time to distinguish between two candidates and does not wish to break ties arbitrarily. It is not clearly resolved in the literature how STV can be extended to handle weak orders without compromising on its computational efficiency or some of the desir- able axiomatic properties it satisfies.7 The backdrop of this paper is that improving upon STV in terms of both PR as well as monotonicity has been posed as a major challenge (Woodall, 1997). 4 There are two PSC axioms that differ in only whether the Hare quota is used or whether the Droop quota is used. The one with respect to the Droop quota has also been referred to as DPC (Droop’s propor- tionality criterion) (Woodall, 1994). Woodall (1994) went as far as saying that “I assume that no member of the Electoral Reform Society will be satisfied with anything that does not satisfy DPC.” 5 Although it is easy to compute one outcome of STV, checking whether a certain set is a possible outcome of STV is NP-complete (Conitzer et al., 2009). 6 One notable exception was philosopher Michael Dummett who was a stringent critic of STV. He pro- posed a rival PR method called the Quota Borda System (QBS) and pushed its case (Dummett, 1984, 1997). However, even he agreed that in terms of achieving PR, “[STV] guarantees representation for minorities to the greatest degree to which any possible electoral system is capable of doing” (Dummett, 1997)[page 137]. 7 Hill (2001) and Meek (1994) propose one way to handle indifferences however, this leads to an algo- rithm that may take time O(m!). 4 Haris Aziz, Barton E. Lee Contributions We propose a new voting rule called Expanding Approvals Rule (EAR) that has several advantages. (1) It satisfies an axiom called Generalised PSC that is stronger than PSC. (2) It satisfies some natural monotonicity criteria that are not satisfied by STV.
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